Spark plug



T. DAVIS.

SPARK PLUG.

APPLICATION FILED Nov. Io; Isala.v

Patented Dec. 12, 1922.

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Patented Dec. 12, 1922.

THERON DAVIS, OF NEW YORK, N. Y.

'i SPARK PLUG.

Application filed November 10, 1919. Serial No. 336,779.

To all whom it may concern.'

Be it known that l, THnnoN Davis. a of the United States.y and r Ai borough of Manhattan. New State ot New York. have inventl useful Improvement in Spark lfiugs 'for in termal-Combustion Engines, of which the following is a full, clear. and exact lescription. I

My invention relates to improvements in spark plugs and the obiect of my invention is to produce a spark plug whicn will. i fe to provide a spark to ignite the charge o internal combustion engine and further n ill provide means for admitting oxycen, airc or the like to the cylinder at each charge.'

It is well known that one of the chief troubles with internal. combustion encines arises from the accumulation of carbon within the cylinder and this carbon will ace-.unalate around the spark plug` so as to make a short circuit. The chief cause of the accumulation carbon is that 'the gaseous tuel is imperfectly Consumed. In adc'tion the carbon interferes with the proper action of the piston. This .imperfect combustion is on account of the lack of sufficient oxygen to maintain perfect combustion. The gaseous material admitted to the cylinder is frequently too rich and as there is little oj present and not enough passes throufr carbureter to provide complete com. us" the result is the product-.ion and deposit' of carbon.

My invention contemplates the elimination of this difficulty by providing a spark plug which will supply air or the like at each stroke ot the piston to afford complete coinbustion by which the deposition of carbon is prevented and greater efficiency is attained. because it follows that more perfect combustion means a more perfect explosion and for a given amount of fuel a greatei` amount of power is obtained.

In carrying out this idea provide an air passage through the spark plug with an. automatic valve in the spark plug.y which after each charge is admitted including the oxygen supply7 will close by the cylinder pressure so as to hermetically seal the air inlet and prevent the leakage of fuel. Then fter the explosion and the exhaust of the exploded charge is released from the cylin der. the aforesaid valve will open under the external ir pressure and permit air to How into the cylinder with the incoming fuel charge. For practical purposes I find that the atmosphere air contains sufficient. oxygen to permit the desired degree of combustion and it will be understood, of course, that oxygen in a more concentrated form may be admitted through the spark plug, all of which will be more clearly understood from the description which follows.

Reference is to be had to the accompanying drawings formi` a part of this specification in which similar reference letters and figures refer to similar parts throughout the complete drawings.

Fig. 1 is a longitudinal section of a spark plug embodying my invention.

Fig. Q is a bottom end view of the plug.

Fi 3 a broken detailed sectional view showing the application of an air filter to the plug.

fl is a broken detailed view showing damper tor regulating the air inlet.

My invention is intended to cover a spark plugin which and' through which air or oxygen is admitted to promote combustion in the cylinder of an internal combustion engine and the drawings are merely by way of example to show a practical means of carryingv out and into effect this lidea with .no intention of limiting the invention to the drawings shown.

As illustrated a shell 10 is used which is more or less conventional and has a threaded lower il to facilitate its attachment to the cylinder. ,Extending longitudinally through the shell and spaced apart there` from. is a hollow electrode 12 preferably in the form of a cylindrical tube which projects from the lower end of the shell and which preferably'has a flange 13 abutting with an insulated washer 14 this being firmly secured in the lower part of the shell. The washer therefore serves the purpose of not only .insulating the electrode but 'of properly spacing it with respect. to the shell.

At the lower end of the electrode is a valve which seats snugly against the end of the electrode and which moves freely in a vertical direction and can be held inpl'ace in any suitable way as for instance by the Wires 16 secured to the lower end of the electrode 12, and extending beneath the Valve The valve is also a conductor and is properly spaced from the second electrode or Wire connectingwith the shell 10 as is usual or in any preferred Way to form a ground connection.

it the upper end of the shell 1h` is a second insulated washer 18 `which is held lirnily in the shell and through which the electrode 12 extends. The upper part oi the electrode is preferably screw-threaded as shoe/'n at 19 to receive the internally screw-threaded end of the nutrneinber 2O which is shown as hollmiY and which has preferably a flanged lower extremity 91 bearing` against `She top of the Washer 18 so that when the hollen nut inernber 2O is screwed down irinlyv on the electrode 19 the Washer 18 Will be elan'iped irn'ily to the top of the shell 1G and the Washer 14 will be clamped iirnily to -the lower end of the shell by reason oi" the lange 1? which underlies the Washer T he rneuiber is or conducting' material and is provided with sir holes located. upon the upper end of the ubulf;A electrode 12 and adapted to adniit 'g 'for the intended purposes.

rlhe upper end of the member 2O is preferably closed and provided with the connnon or any preferred bindingpost Connection as shown at il desired a sleeve 24 can he pleced over the member 20 this sleeve having; air inlets therein and by turning; the sleeve 'the desired amount of air can be permitted te pass through and intor the electrode, this sleeve acting like an ordinary register.

From the foregoing description it will be seen that after the charge has been exploded so that the internal pressure in the cylinder is reduced the valve 15 Will drop under the pressure or the outside air and air will be drawn or flow in through the openings 22 and the electrode 12 to the Cylinder and when the internal pressure exceeds the outside pressure the valve Will loe forced to its seatand Will preventthc escape of the iniX- ture through the plug'. @briously the eleotrode may be provided with a inore concentrated torni oit oxygen or air under pressure if desired.

.lt will or course be readily seen that the detailed construction which l have described may be changed materially without afdiecting` the principle oi the invention. For some purposes it may be desired to filter ther air passing into 'the cylinder so as to exclude dust or exraneous matter and this can be' done easily hy surrounding the member with ay suitable casingv 26 which can be attached to the Washer 18 or any other part of the plus; and this can have ballies 27 eKu tending'- inw'erd and preferably downwardly inclined so as to allowT space between their inner edges" and the member 2O and oily ifieeeoo Waste or other liltering; material can he placed upon the baffles.

l clairn:

1. i spark plug` comprising a` shell adapted for attachment to cylinder, ay tubular electrode extending longitudinally through. the shell and insulated and spaced apart. thereironn said electrode haring an unobstructed air i extending entirely through it l'roin end to end,v a guided valve opposite and adapted to close against the inner end of the electrode, and a nut rneinber fitting over the outer end 1'" the electrode and adapte l to en the f te the sl ell said nutI niernl air openings tligou 2. A sparlr pluf ed for attaclindC e cylinder. a tubular electrode entendinglongitudinallwv through ilze shell and insulated and spaeed apartthereieroin so as to leave an eir space between the sheli and electrode, and Valve opposite and adapted close. against the inner o1;-

as to leave the` and nieans for ll nieve in and inner end of the treinity or the elect ode so bore of the electrode 'lree guiding' the valve so that out with relation the electrode.

lli sparlr plug comprising' a shell adapted for attachment to a c'fflind u en insulat- Washer at the inner portion ot the shell, an insulating was-fier at the outer part of the shell. an electrode ext/udine; through and held by the seid rmshers, a hollow nut member ttinpj the outer it. oit the elec trede and abutting with the outer washer, said nut ineinher haring air open ings there in7 and freely moving independ at the inner of he elec,y open and close 'lil saine.

A. spark pi comprising; a shell'aoapt ed ior attachmen te a yh a hollow electrode errtending` long* the shell and insulated l aced apart therefrom, a. it ly nioringr independent Valve at the inner end oil' the electrode? a. hol low .nut inenihcr .er the outer end oi the elect sai it ineniber having air openings therethrough. and ineens for regulating the inliouT of' air.

5. spark plug` having; shell adapted 'for attachmentlto a cylinder, a tubular electrede extending? through the shell and insulated therefrom, a hollow nut nieniber counected with the outer end oit the electrode and provided with pe Vtorated walls,` and a. perforated sleeve turning' on the said nut member by which the air openints may be regulated.

through Tensor' Davis.

Witnesses':

Yvelines' B. Hnroriinsoir.. M. T. ODONNELL. 

